KR100901971B1 - Apparatus for scanning a user's touch in touch screen - Google Patents

Abstract

An infrared touch scanning module is provided to improve the overall scanning speed by alternatively realizing originating signals based on the unit module group concept. So that a transmitting unit and a receiving unit can be alternately adjacent to each other, an infrared unit module is arranged. Driving circuits(301,302) turn on/off the transmitting unit and receiving unit. A sensing unit(304) outputs a discrimination signal and RSSI(Received Signal Strength Indication) of the receiving unit which receives a signal. A control unit(317) divides each infrared unit module into the predetermined number of groups, and controls the transmitting unit so as to sequentially transmit an infrared signal one to one according to each group.

Description

Infrared touch scanning module {Apparatus for scanning a user's touch in touch screen}

The present invention relates to an infrared touch scanning module, and more particularly, to a coordinate scanning apparatus of a touch screen used in an automated apparatus capable of processing an ultra-fast object detection function and multi-point coordinates by measuring an object's position in a pulsed infrared transmission and reception method. will be.

Infrared touch generally measures the position of an object in accordance with the transmission and reception result of the object of the infrared transmission and reception elements arranged. The infrared signal is radiated as an AC signal of several tens to hundreds of KHz, and then averages the collected AC signals according to the presence or absence of an object, and measures the size of the signal.

However, this method brings limitations of sensitivity and overall response speed due to the time for averaging the collected AC signals and the remarkable degradation of the frequency response of the infrared transceiver elements by the high frequency signal.

In addition, according to the conventional method of operating the light emitting unit and the light receiving unit at the same time, it is interfered with each other by different light sources, so that the reception unit cannot expect to receive the correct signal, and as a result, it is impossible to calculate the correct coordinates.

As to solve the above problems,

SUMMARY OF THE INVENTION An object of the present invention is to provide an infrared type unit module that is easier to calculate coordinates faster than a unit module including a transmitting and receiving element used in a conventional touch screen.

Another object of the present invention is to provide a means for improving the overall scan speed while using the above-described unit module.

In addition, an object of the present invention is to provide a means for calculating the coordinates of the correct touch using the scan speed improving means.

It is also an object of the present invention to provide a means for calculating the diameter of an object.

Another object of the present invention is to provide a means for calculating a multi-coordinate and a diameter for each touch.

In order to achieve the above technical problem,

In the unit input module used in the touch screen input device, the infrared unit module according to the present invention includes a transmitter, a receiver, and a counter.

The transmitter transmits a pulsed infrared signal.

The receiver receives an infrared signal transmitted from the transmitter and generates a predetermined signal only in a frequency band in which a signal having a reference voltage or more is received.

The counting unit sums the signal output from the receiving unit and the reference clock and counts the number of clocks in the portion where the predetermined signal of light occurs.

In the apparatus for scanning a user touch of a touch screen using the infrared unit module as described above, the infrared touch scanning module according to the present invention includes a signal switch, a sensing unit, and a control unit in addition to the infrared unit module.

In this case, the infrared unit module is disposed such that the transmitter and the receiver are alternately positioned at opposite sides of the touch screen scanning area.

The driving circuit turns on and off the operation of each transmitter and receiver.

The signal crossover functions as a path control function for transmitting and receiving signals to transmitter and receiver circuits sequentially and simultaneously.

The control unit divides each infrared unit module into a certain number of groups, controls one transmitter to transmit infrared signals for each group, and calculates coordinates by receiving a receiver distinguishing signal and a received signal strength from a signal crossing unit.

The control unit may control a group of adjacent infrared unit modules to transmit infrared rays in opposite directions.

In addition, the control unit may calculate the average value of the minimum coordinate value and the maximum coordinate value of the received signal with the effective intensity except the effect of the interference as the coordinate value of each coordinate system.

In addition, the control unit calculates a multi-coordinate value by using a minimum value and a maximum value for each group when a signal received with a valid intensity consists of several consecutive groups.

Meanwhile, the controller may calculate a difference between the minimum coordinate value and the maximum coordinate value of the signal received with the effective intensity as the diameter value of the object.

Further, the control unit may calculate a diameter value for each group by using a minimum value and a maximum value for each group when a signal received with an effective intensity consists of several consecutive groups.

In addition, the control unit may determine the multi-point input when the signal received with the effective intensity is composed of a plurality of consecutive groups and calculate a value for each group.

라 할 때 D값이 기 설정된 제한 범위 내에서 입력된 경우에만 정상적인 입력으로 판단하는 후처리 모듈을 더 포함할 수 있다.Furthermore, the calculated x and y axis diameters are Rx and Ry, respectively.

In this case, the D-processing module may further include a post-processing module that determines that the input is normal only when it is input within a preset limit.

On the other hand, by dividing the touch screen into a predetermined area, the representative coordinate value is set for each divided area, and when each coordinate group by the multi-point input is included in a specific divided area, the representative coordinate value is recognized as the coordinate value for the corresponding input. It may further include a processing module.

의 k번째 이후의 변화

를 산출하여 P가 0보다 크면 당기기로 그렇지 않으면 밀기로 판단하는 후처리 모듈을 더 포함할 수 있다.On the other hand, the diameter of the i-th read object when the coordinate group is continuously changed by multi-point input

Since the kth of

If the P is greater than 0 to calculate the may further include a post-processing module to determine to pull or push.

와

로 산출하고, k번째 이후의 x축 및 y축상 각각의 좌표변화

와

을 산출하여 각각의 Z값이 0보다 작으면 확대 0보다 크면 축소로 판단하는 후처리 모듈을 더 포함할 수 있다.When the coordinate group is changed continuously by multi-point input, the coordinates on the x and y axes of the nth and mth coordinate groups measured at the i th measurement are measured.

Wow

And change the coordinates on the x and y axes after kth

Wow

The method may further include a post-processing module that determines that each Z value is smaller than 0 and enlarged when larger than zero.

를 산출한 후 k번째 이후의 기울기 변화

를 산출하여 T값의 부호에 따라 회전의 방향을 판단하는 후처리 모듈을 더 포함할 수 있다.When the coordinate group is changed continuously by multi-point input, the slope of these two points is based on the coordinates on the x and y axes of the nth and mth coordinate groups measured at the i th measurement.

Inclination after kth after calculating

The method may further include a post-processing module configured to determine the direction of rotation based on the sign of the T value.

From the structural features of the present invention described above,

The present invention facilitates faster calculation of coordinates than a unit module including a transmitting and receiving element conventionally used in a touch screen.

In addition, the present invention can improve the overall scan speed by introducing the concept of a unit module group and by making the outgoing signal cross.

In addition, the present invention can calculate the coordinates and diameter of the correct touch, and at the same time to calculate the coordinates and diameter of each even if multiple touch is made.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1. Configuration of the infrared unit module 100

The infrared unit module is a device constituting the unit of the infrared input module constituting the touch screen input device is configured as shown in FIG. A plurality of such unit modules are provided to configure one touch screen input device. It will be described in detail below.

In FIG. 1, the infrared ray transmitter 108 includes an amplifier 111 for amplifying a pulsed signal such as the transmission signal 112, a light emitting element 109, a signal switch 110, and a signal switching signal TR.

The receiving unit 116 outputs a signal such as 114 by comparing the receiving element 106, the signal switch 105, the narrow band filter 104 for processing the received signal 113, the signal and the reference voltage REF. It consists of a comparator 103.

The signal output from the comparator 103 adds the reference frequency 115 (CLK) to the AND logic 102 and then adds the frequency through the frequency counter 101 when the magnitude of the light is greater than the reference voltage REF. The number of the received light is converted into digital.

The principle of the infrared unit module will be described with reference to FIG. 2.

The infrared unit module 100 will be described by dividing it into the cases of 201 to 203 according to the degree of interference of the object between the transmitter 106 and the receiver 116. That is, when the transmitter transmits the pulse signal 204, when there is no object in the transmission / reception element 201, when the object attenuates and transmits about 50% of the transmitted light (202), and the entire transmission / reception by the object. This dividing case (203) will be described.

In the case where there is no object 201 between the transmitter 106 and the receiver 116, as shown in 205, the entire signal outputs the longest duty cycle value based on REF. This result outputs the number CLK (n) of the clock through 102 and 101 of FIG.

When the object attenuates and transmits about 50% of the transmitted light (202), it outputs about 50% CLK (n) than when there is no object (201) in between, and when the entire transmission / reception is attenuated by the object ( 203 outputs CLK (n) as zero.

The above operation is performed when the received value is the maximum value at the position where the transmitted signal is proportional to the total light intensity and the REF and the received signal have the same value as indicated by the dotted lines in the graphs of 205 to 207 of FIG. Proportional to the slope, this proportional degree is based on the principle proportional to the duty cycle of the signal output by the comparator 103.

In other words, this method passes through the band pass filter BPF so that the received signal b2 received from one cycle of the outgoing signal b1 passes only the band above the reference voltage REF as shown in FIG. The clock signal b3 (see [Fig. 1] 115) corresponding to the output waveform (refer to 114 in [Fig. 1]) after being made, and the total received frequency signal a2 for the plurality of cycle signals a1. Compared to the conventional method of reading the average value (RMS) of the infrared signal to the ADC, it is possible to measure the signal much faster. For example, compared to the conventional method using a 100KHz / 10Cycle signal, the present invention capable of touch recognition with only 100KHz / 1 Cycle is arithmetic improvement of 10 times or more.

In addition, since the signals after the comparator 103 are all digital, the distortion of the signal is minimized.

2. Infrared touch scanning module 300

In the infrared touch scanning module, positioning of the infrared unit module 100, that is, transmission / reception of a transmission / reception element is the maximum factor for determining the response speed. This example was configured as shown in Figure 4 to improve the reaction rate.

 The infrared touch scanning module 300 of the present embodiment scans a user's touch by emitting infrared rays in both directions, rather than a method of emitting infrared rays in a single direction, unlike in the related art. It demonstrates concretely below.

The infrared touch scanning module 300 of the present embodiment includes a transmitter driver circuit 301, a receiver driver circuit 302, an analog switch 304, a receiver 116, a transmitter 108, and a controller 317. .

The transmitter 108 and the receiver 116 of the infrared unit module 100 quantify the interference of the object through the transmission and reception of the infrared pulse signal in the manner described above.

4 and 5,

는 현재 작동하지 않는 116 수신부 모듈을,

116 receiver module not currently working,

는 현재 작동하지 않는 108 발신부 모듈을,

108 callout module, currently not working

는 현재 작동하는 116 수신부 모듈을,

116 receiver module currently operating,

는 현재 작동하는 108 발신부 모듈로 정의할 때,

Is defined as the 108 calling module that is currently working,

In the present embodiment, as shown in 401 of FIG. 5, eight elements are arranged in one module group, and the transmitting unit 118 and the receiving unit 116 are alternately arranged and neighboring module groups 402. ) Is arranged in reverse order of the transmitter 118 and the receiver 116.

Each module group is arranged such that the transmitter 106 (see 309 of FIG. 4) for transmitting an infrared signal and the receiver 116 (see 306 of [FIG. 4]) for receiving the infrared signal face each other. Both module groups 401 and 402 arranged to face each other are defined as a pair of module groups.

The sensing unit 304 detects the coordinates of each module group that is arranged and operated continuously on the touch screen in the upper and lower sides and the left and right sides, respectively. Each detector 304 divides the touch screen onto an X-axis and a Y-axis, and then outputs the coordinates and infrared intensity of each module or a pair of modules in which a signal is detected.

The operation at this time will be described with reference to [FIG. 4] and [FIG. 5]. 5 shows progressing to A, B and C over time.

In one module group, as shown in A of FIG. 5, when the first transmitter 106 and the receiver 116 operate, the second transmitter 106 sequentially neighbors as shown in B next. And the receiving unit 116 is changed only to operate the direction. In the same way, the turn of the finishing device works as shown in C.

At this time, the pair of modules adjacent to the left and the right start to emit infrared rays in the opposite direction to the pair of adjacent modules such as 309 and 307 312 of FIG. 4. As the direction of the transmitting unit 106 that transmits infrared rays at the same time for each adjacent module group is changed, the interference of each other can be minimized.

In addition, by radiating infrared rays by using eight transmitting / receiving devices as one group, the CLK (n) can be calculated at least eight times faster than the method of sequentially dividing the touch screen into X and Y axes and sequentially scanning the touch screen.

In this case, the total number of the infrared unit module 100 disposed is related to the scanning resolution. That is, the more the infrared unit module 100 is arranged, the more accurate the scan is possible.

3. Calculation of coordinates and diameter

In this case, the coordinate calculation by the infrared reception will be described in detail with reference to FIG. 6.

CLK (n) for each X and Y is stored in the memory of the controller 317 in the above-described manner and then calculated as follows.

When F is defined as the maximum value of the counter 255,

가 된다.

Becomes

일 때를 물체(10)에 의해서 적외선 신호가 간섭받는 정도를 감안한 유효 계산값으로 규정한다.On the other hand, you set threshold A, which is

Is defined as an effective calculated value considering the degree to which the infrared signal is interfered by the object 10.

At this time, the coordinates are calculated as follows using the first valid value and the last valid value.

이고, n=0,1,2,…

이며, L은 논리적인 좌표의 최대크기(예를 들어 65535)이고,

는 X축 수발신 모듈(LED)의 개수이다. 한편, n은 첫 번째 시작하는 유효값을 의미하며, m은 마지막 가려지는 유효값을 의미하는 것으로서, 물체에 의해서 가려지는 모듈의 개수는 m-n (m>n)이 된다. 이는 x 및 y축이 마찬가지로 공통된다. At this time

And n = 0,1,2,...

L is the maximum size of logical coordinates (eg 65535),

Is the number of X-axis receiving and receiving modules (LEDs). On the other hand, n means the first valid value, m means the last valid value, the number of modules covered by the object is mn (m> n). This is common for the x and y axes as well.

In this case, the coordinate value is obtained by calculating the average of two valid values as follows.

Subsequently, the coordinates are calculated in the same manner with respect to the other Y-axis.

The diameter of the object 10 is calculated as follows.

J is an index indicating the position and diameter of each object by recognizing each group as one object when several objects 10 are placed, that is, when successive effective values are measured by several groups.

4. Multi-coordinate calculation

On the other hand, when there are several groups in which a signal received with a valid intensity is continuously displayed based on a coordinate system, it may be determined that there are at least two touches. In this case, it is necessary to determine the group of each successive value with one touch and to obtain respective coordinates and diameters according to the above-described method. This will be described in detail as follows.

A flowchart for calculating multi-coordinates is shown in FIG. 8.

The scanned C (n) s are stored in the memory of the controller 317 for the calculation of the coordinates. (S10) Next, the index I for the X-axis or the Y-axis and the number J of the multi-coordinates are initialized (S20). The index m of the received receiving module is initialized (S30). At this time, if the threshold value C (I)> A is determined, i.e., it is determined whether the receiver is interfered by an object (S40). To increase the value of one by one and go to step S40 (S50), if the value of the non-interfering meaning is determined whether m> 0, that is, whether there is an interference module (S60).

In this case, if m> 0, the coordinate and diameter information is stored in the memory based on the above formula (S80), and the J value is increased by one (S90). Move to S30 otherwise measure the Y-axis coordinates in the same manner again.

On the other hand, if m = 0, the value of I is increased by one more (S70), and then the process moves to step S30.

,

으로, 각각의 지름은

,

으로 표현된다.Each coordinate is

,

, Each diameter

,

It is expressed as

Here, if J obtained based on the X axis is N, and in the case of M in the Y axis, the number of multi-coordinates obtained by the total combination is calculated as N × M.

However, as shown in FIG. 7, when the real objects are assumed to be 801 and 802, 804 and 803 correspond to virtual images. The virtual image is masked by the real image, and the position of the object cannot be determined. However, by installing an infrared unit module for verifying this in addition to the X and Y axes, the probability of accurately identifying the position of the virtual image is increased.

5. Post-Processing Steps

9 is a block diagram illustrating an example in which the calculated coordinates are stored in a memory and then connected to various input devices. The coordinate data stored in the controller 701 is physically connected to the host driver 706 of the information apparatus through an interface such as USB / SERIAL / PS2, which is a wired method. In addition, the wireless modem 702 may be transferred to the information device-side modem 704 and connected to the host driver 706 via the physical interface of the standard wired USB / SERIAl / PS2.

After being connected in the form of a standard HID (Human Interface Device) driver 707, the data is processed by the post-processing module 711, and then coordinated with a general input device (eg, a mouse-generally a single point recognition device). By using the event 708 and the shared memory technique so that information can be transmitted or other applications 710 of the information terminal can utilize the data efficiently, a specific event is delivered to various programs 710, and at the same time to the unique memory The data may be stored to allow an application to read data from this memory, or may be configured to allow the application to access the data in a standard program format via a common TCP / IP server 709.

On the other hand, the job in the post-processing module 711 is the conditional processing based on the coordinates input from the host driver (S200), as shown in Figure 10, the transmission condition step (S210) for controlling the transmission of the position data ) And a path determining step (S220) for determining a trace of the object (s) and transmitting data in various transmission formats (S230).

In the step S200 of processing conditions based on the coordinates input from the host driver, functions such as diameter limit, grid area limit, number limit, and order limit may be selectively performed as follows. Each function will be described below.

으로 계산할 때 (최소값 < D < 최대값), (최소값 < D 그리고 D > 최대값)이라는 조건을 만족할 때, 물체의 적외선 면의 터치로 인식한다. 이 방식은 특정한 지름을 갖는 물체만을 터치로 인식하여 오작동을 최소화하는 기능을 제공한다.First, the diameter limit is the diameter of each object

When it is calculated as (Min <D <Max) and (Minimum <D and D> Max), it is recognized as touch on the infrared side of the object. This method provides the function of minimizing malfunctions by detecting only an object having a specific diameter as a touch.

Grid region limitation is a function for minimizing the complexity between coordinates of the regions generated by logically dividing the entire region into portions, as shown in FIG. 11, respectively, as Gx 1103 and Gy1104, and in the case of 1102 and 1101, respectively. As shown below, if the set of coordinates is smaller than this area, it is the area limit function that selects only the center value and recognizes it as one coordinate. This feature reduces the complexity of the coordinates and provides the ability to recognize only movements in a large area as coordinates.

The number limit is a function that minimizes unwanted touches by providing a function that allows or restricts only the Nth coordinate or less from sequentially input coordinates, and the order limit is the first or Nth input only in the provision of the coordinates. It's a feature that you can limit.

In step S220, a transmission condition is automatically and manually provided to provide a function of generating and transmitting data compatible with a standard input device driver displaying only one point coordinate.

In operation S230, a function of recognizing the following basic object behavior is provided based on a change in coordinates scanned from multiple touches. Basic behavioral recognition may be, for example, push and pull, zoom, or turn.

의 변화

을 바탕으로 P > 0이면 당기기로, 그렇지 않으면 밀기로 판단하고, 그 크기는 P/k로 밀기 및 당기기 면적의 변화에 비례하여 계산된다.Push and pull is the diameter of the i th read object

Change

If P> 0, it is determined as pulling, otherwise it is determined as pushing, and its size is calculated in proportion to the change of pushing and pulling area at P / k.

와

로 산출하고, k번째 이후의 x, y축상의 좌표변화

와

을 산출하여 각각의 Z가 Z < 0이면 확대, Z > 0이면 축소로 판단하고, 이 확대와 축소의 크기는 절대값 Z/k로 계산하여, 이동 속도가 확대 및 축소에 크기에 비례하도록 계산한다.Zoom in / out is the coordinates on the x and y axes of the nth and mth coordinate groups measured at the i th measurement.

Wow

Calculated by, the coordinate change on the x and y axis after kth

Wow

It is determined that each Z is zoomed in when Z <0, and zoomed out when Z> 0, and the magnitude of the zoom in and zoom out is calculated by the absolute value Z / k, so that the moving speed is proportional to the zoom in and zoom out. do.

를 산출한 후 k번째 이후의 기울기 변화

를 산출하여 T < 0 이면 오른쪽 회전, T > 0 이면 왼쪽 회전으로 판단하고, 회전의 크기는 T/k의 절대값에 비례하도록 계산한다. Rotation is the slope of these two points based on the coordinates on the x and y axes of the nth and mth coordinate groups measured at the i th measurement.

Inclination after kth after calculating

If T <0, it is determined to be right turn, and if T> 0, it is determined to be left turn, and the magnitude of rotation is proportional to the absolute value of T / k.

An algorithm for recognizing basic behavior by multiple points is shown in FIG. 12.

First, the coordinate reading counts i and k are initialized (S300). Next, the measurement value corresponding to the above basic behavior recognition is read (S310). After the measured value is calculated (S320), if each measured value is greater than the threshold value G (S330), the calculated value is transmitted to the application (S360) and initialized to i = k (S350), and then the process moves back to step S310. . If the measured value is smaller than the threshold value, the same operation is repeated by reading the next time coordinate (S340).

Although the preferred embodiments of the present invention have been described above, the technical spirit of the present invention is not limited to the above-described preferred embodiments, and coordinates of various touch screens are not limited to the technical spirit of the present invention specified in the claims. It can be implemented as an input device.

1 is a block diagram showing the configuration of an infrared unit module according to the present invention.

Figure 2 is a graph showing the principle of the infrared unit module according to the present invention.

3 is a reference diagram for comparing the operating principle of the infrared unit module and the conventional infrared unit module according to the present invention.

4 is a block diagram showing a configuration of an infrared touch scanning module according to the present invention.

Figure 5 is a schematic diagram showing the operation of the infrared touch scanning module according to the present invention.

6 is a schematic view for explaining the coordinate calculation according to the present invention.

7 is a schematic diagram for explaining a virtual image during multi-coordinate calculation according to the present invention.

8 is a flowchart illustrating a multi-coordinate calculation process according to the present invention.

9 is a block diagram illustrating an example of connecting to various input devices after a scanning process according to the present invention.

10 is a flowchart showing the operation steps in the post-processing module according to the present invention.

11 is a schematic diagram for explaining the grid area limitation according to the present invention.

12 is a flowchart illustrating the basic behavior recognition by multiple points according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: infrared unit module 101: frequency counter

102: AND logic 103: comparator

104: narrow band filter 105: signal switch

106: receiving element 108: transmitting unit

109: light emitting element 110: signal switch

111: amplifier 116: receiver

301: transmitter drive circuit 302: receiver drive circuit

304: detection unit 317: control unit

Claims (11)

delete A transmitter for transmitting a pulsed infrared signal, a receiver for receiving a infrared signal transmitted from the transmitter, and generating a predetermined signal only in a frequency band in which a signal having a reference voltage or more is received, and a signal output from the receiver and a reference clock are added up. An apparatus for scanning a user's touch of a touch screen by using an infrared unit module comprising a counting unit for counting a number of clocks in a portion where a predetermined signal of light is generated. An infrared unit module provided in pairs such that the transmitter and the receiver face each other of each side of the touch screen scanning area, and the transmitter and the receiver are alternately adjacent to each other; A driving circuit for turning on and off the operation of each transmitter and receiver; A detector for outputting a distinguished signal and a received signal strength of a receiver from which a signal is received; And Control unit for dividing each infrared unit module into a certain number of groups to control the transmitter to send infrared signals sequentially one at a time for each group, and to calculate the coordinates by receiving the receiver distinguishing signal and the received signal strength from the sensing unit: Infrared touch scanning module comprising a. The method of claim 2, The control unit is an infrared touch scanning module for controlling so that the direction of the infrared rays transmitted from the group of the adjacent infrared unit module are opposite to each other. The method of claim 3, The control unit is an infrared touch scanning module for calculating the average value of the minimum coordinate value and the maximum coordinate value of the received signal with the effective intensity excluding the effect of the interference as the coordinate value of each coordinate system. The method of claim 4, wherein The control unit is an infrared touch scanning module for calculating the difference between the minimum coordinate value and the maximum coordinate value of the signal received at the effective intensity as the diameter value of the object. The method of claim 5, The control unit is an infrared touch scanning module for calculating a value for each group is determined as a multi-point input when the signal received with the effective intensity consists of a plurality of consecutive groups. The method of claim 6, The calculated x- and y-axis diameters are Rx and Ry, respectively, and the variable j represents the j th object that interferes with the infrared rays.

In this case, the infrared touch scanning module further comprises a post-processing module that determines that the normal input only when the D value is input within the preset limit. The method of claim 6, A post-processing module that sets a representative coordinate value for each partition by dividing the touch screen into a predetermined area and recognizes the representative coordinate value as a coordinate value for the corresponding input when each coordinate group by the multi-point input is included in a specific partition area. Infrared touch scanning module further comprising. The method of claim 6, The diameter of the i-th read object when the calculated x- and y-axis diameters are Rx and Ry, respectively, and the variable j represents the j-th object interfering with infrared rays, when the coordinate group by the multi-point input changes continuously.

Since the kth of

Infrared touch scanning module further comprising a post-processing module to determine if the P is greater than 0 to pull or otherwise push. The method of claim 6, When the coordinate group is changed continuously by multi-point input, the coordinates on the x and y axes of the nth and mth coordinate groups measured at the i th measurement are measured.

Wow

And change the coordinates on the x and y axes after kth

Wow

Infrared touch scanning module further comprising a post-processing module for determining that if each Z value is less than 0, the magnification is larger than 0. The method of claim 6, When the coordinate group is changed continuously by multi-point input, the slope of these two points is based on the coordinates on the x and y axes of the nth and mth coordinate groups measured at the i th measurement.

Inclination after kth after calculating

Infrared touch scanning module further comprising a post-processing module for calculating the direction of rotation according to the sign of the T value.

Images